How did the line of demarcation change history? explain

i am confused, what is the question? i can you out if you put it into more depth.

answer; to be the responsible party for healthcare delivery through medicare and medicaid programs;

answer; the smaller of the two reciprocal products of translocated chromosomes is lost; after several cell divisions, only the larger of the two translocated chromosomes remains,its reciprocal is lost;

answer; protecting domestic national security; i believe this is correct,plz check first,good luck;